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PD PD

MinMin

MinMin 100%

100%100%

MaxMax 82.3%

M2 Taps M3

MaxMax

Min Taps

Max Length of 74.1%82.3%

Length of engagement engagement=18.1mm On "middle" engagement class, 7H class can be chosen M4 in case of "L" engagement length. Internal threads made by roll taps are Engagement different from those made by cutting

Internal threads Taps classification taps on the shape of minor dimameter. Engagement Unit : mm D1 Unit : mm length

Engagement External threads *Hole size for thread forming taps

length classification Drill size Min Max M5

(ref.) Min Max

S Short engagement length 4H 5H — S 6(mm)

Bored hole size10.310.106 10.441Taps
11.0911.23

M Normal engagement length 5H 6H 7H 6 M 18(mm)

Engagement ratio89.7%100%82.3%
Forming condition changes depending

L Long engagement length 6H 7H 8H 18 L(mm) on workpiece's Material and shape.

P=1.75mm D1 is minor diameter of JIS 6H(2nd Class) of internal threads Above is for customer's reference. M6 Taps Tolerance area of tap's pitch diameter

M8 Thread class of cutting taps Taps 【Pitch diameter】

Internal threadsInternal threadsClassPD tolerance
Diameter of imaginary cylinder or cone
which makes equal the width of threadsISO248μm〜80μmM10
and width of space between the threadsμ〜μ
ISO2X73m 105mTaps

ISO2ISO2 *Above shows the plus tolerance by setting PD basic size as "0". ISO2XISO2X M12 Width of Width of Taps

threadsthreads Thread class of roll taps

Width of space Width of spaceClassPD toleranceM1-M
between threadsbetween threadsISO2X 127μm〜140μm7
Taps
Pitch Pitchμ〜μ
ISO3X 152m 165m
diameterdiameter
ISO2XISO2X*Above shows the plus toleranceM9-M
ISO3XISO3Xby setting PD basic size as "0".24
Taps
Basic size of pitch diameterM25-M
10.863mm
-200μm-150μm-100μm-50μm+50μm+100μm+150μm+200μmTaps48
←For Unified
6gISO2XISO3XRoll tapsthreads
Taps
Tolerance of dies is theISO2←
Cutting taps
target of external threadsISO2X
For Whitworth
Class of diesthreads
6g6g external threads(-184〜-34) Solid dies 6H internal threads(0〜200)Taps

NRNR GRGR GPGP NPNP

For Pipe threads Relative position of PD tolerance area of external threads, internal threads, taps and gages. Taps

For Pg threads

(–)←Basic size of pitch diameter→(+)Taps
10.863mm
Unit : mUnit : m
Ring gage pitch diameter(for external threads inspection)Plug gage pitch diameter(for internal threads inspection)

NR6g -202 〜 -184 GR6g -51 〜 -33 GP6H 7 〜 17 NP6H 200 〜 210

NR : NOT GO ring gage GP : GO plug gage GR : GO ring gage NP : NOT GO plug gage Unit : mm Unit : mm Accuracy of external threads Accuracy of internal threads

Major diameter Pitch diameter Minor diameter Major diameter Pitch diameter Minor diameter

6g 11.701〜11.966 10.679〜10.829 − 6H − 10.863〜11.063 10.106〜10.441